Angular form control and form group

In this video we will discuss FormControl and FormGroup classes

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When working with reactive forms we create instances of FormControl and FormGroup classes to create a form model.

To bind an HTML form tag in the template to the FromGroup instance in the component class, we use formGroup directive

To bind an HTML input element in the template to the FormControl instance in the component class, we use formControlName directive

formGroup and formControlName directives are provided by the ReactiveFormsModule

Both FormControl and FormGroup classes inherit from AbstractControl base class

The AbstractControl class has properties that help us track both FormControl and FormGroup value and state

The following are some of the useful properties provided by the AbstractControl class
value
errors
valid
invalid
dirty
pristine
touched
untouched

FormControl instance tracks the value and state of the individual html element it is associated with

FormGroup instance tracks the value and state of all the form controls in it's group

To see the form model we created using FormGroup and FormControl classes, log the employeeForm to the console.

onSubmit(): void {
console.log(this.employeeForm);
}

To access a FormControl in a FormGroup, we can use one of the following 2 ways.

employeeForm.controls.fullName.value
employeeForm.get('fullName').value

Note: This same code works, both in the template and component class.

In addition to these properties, AbstractControl also provides the following methods. In our upcoming videos we will use these properties and methods for form validation and working with data.
setValidators()
clearValidators()
updateValueAndValidity()
setValue()
patchValue()
Reset()